Limekiln



Jan, 23, 1923. 1,442,845

V. ARNOLD.

LIME KILN,

ORIGINAL FILED APR. 21. 1919. 3 SHEETS'SHEET 2 .F::: I LIIII]:

. 2- AMT-A L INVENTULQ Patented den. 23, 1923.

VALENTINE ARNOLD, 01E WQODVILLE, OHIO.

LIMEKILN.

App1ication filed April 21, 1919, Serial No. 291,661 Renewed November 23, 1522.

To all whom it may concern:

Be it known that I, VAL NTINE ARNOLD, a citizen of Austria, and a residen of Voodville, in the county of Saifiduskyand State of Ohio, U. S. 1L, have invented a certain new and useful Limekiln; and Ido hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the characters of reference marked thereon, which form a part of this speciiication.

This invention relates to lime kilns, and has for its object the provision of an improved kiln of this character, which has its lime burning chamber or retort of peculiar shape, whereby a rapid and eiiicient burning of the lime therein is accomplished and a retarding of the flow or passage of the lime therethrough effected.

While the invention, in its broader aspect is capable of embodiment in numerous forms, a preferred embodiment thereof is illustrated in the accompanying drawings, in which,-

Figure 1 is a vertical section of a kiln embodying the invention taken on the line 11 in Fig. 2. Fig. 2 is a similar section on the line 2-2 in Fig. 1. Fig. 3 is a top plan view of the kiln, and Fig. 4 is a cross section on the line 4-4; in Fig. 1.

Referring to the drawings, 1 designates the stack of a kiln embodying the invention, which stack, in the present instance, rests on a base portion 2 and cooperates therewith to form a vertically disposed retort passage 3, in which the burning of the lime takes place, as well understood in the art, and in which the feature of my present invention particularly resides.

The walls of the passage 3 are of peculiar contour and provide the passage, in successive order from top to bottom thereof, with the hopperlike head portion A, the restricted neck portion 13, the body portion C, and the base or leg portion D, which latter, in the present instance, is disposed within the base portion 2 of the kiln and is provided at its lower end with the extension E formlng the dischar 'e outlet of the passage. The discharge of tie burned lime from said outlet is controlled by the customary gate 6.

The base portion 2 of the kiln is provided with slack arches 4, at each of two opposite sides of the leg portion D of the retort passage, and each slack arch has communication at its upper inner end portion with said leg portionD through passages5. Each arch also has doors 6 for the introduction of fuel. The leg portion D of the retort passage is of elongated form in cross section with its greatest dimension transverse or at right angles to the flame introducing passages 5, as shown in Fig. 3, thusmaking it possible to place two or more slack arches 4.. at each side of the retort.

The head portion A of the retort passage is preferably of circular form and is conicaliy restricted to the upper end of the restricted neck portion B, which is also preferably circular in cross section and of shallow depth as shown.

The wall of the retort chamber C flares outward and downward from the lower edge of the neck portion B in curved form, as at a, and the two opposite walls thereof, which may he termed the end walls, continue outward and downward on an incline to the end portions of the transversely elongated leg portion D of the retort passage, while the other two opposite walls, which may be termed the side walls and are disposed transverse to the slack arch passages 5, are drawn inwardly toward the bottom portions to coincide with the side walls of the leg portion D. It is thus evident that the body portion C of the retort passage is of greater width at its upper portion than at its lower portion widthwise of the leg portion D and is of less width at its upper portion than at its lower portion lengthwise of the leg portion D, or transverse to the slack arch passages 5.

It is found in practice that in the burning of certain grades or kinds of lime, the lime has a tendency to cake and. adhere to the sides of the retort chamber so as to retard the passage of the lime therethrough, whereas in the burning of other kinds of lime, the lime remains in a more or less loose form so that it passes freely through the retort passage. In the latter case, it is desirous to use a retort chamber having its walls of peculiar shape so as to tend to retard the flow or passage of the lime therethrough. This retarding effect is produced in the present case bymaking the side walls of the retort chamber C of undulated or wavy form from the upper ends thereof downwardly, the undulations being horizontal and gradually diminishing in size toward the lower end of the chamber, or substantially to the upper end of the leg portion D, and those of opposing walls having opposite curvatures. These undulations are designated Z) and form a continuation of the outwardly flaring upper end portion a of the walls, as shown. It is found that this form of retort chamber causes an eflicient retarding of the downward passage of the lime therethrough.

I wish it understood that my invention is i not limited to any specific construction, ar-

rangement or form of the parts, as it is capable of numerous modifications and changes without departing from the spirit of the claims.

Having thus described my inventionfwhat I claim as new and desire to secure by Let ters Patent, is,

1. A kiln of the class described having opposing walls of its retort chamber horizontally undulated.

2. A kiln of the class described having opposing walls of its retort chamber horizontally undulated, the undulations of .said opposing walls having opposite curvature.

3. A kiln of the class described having opposing walls of its retort chamber horizontally undulated, the undulations of said opposing walls diminishing toward the bot tom of the kiln.

4:. A kiln of the class described having its retort chamber flared sharply outwardly to materially increased cross sectional area immediately below its inlet mouth, a pair of opposing walls of said chamber then being horizontally undulated, the undulations forming a continuation of the outwardly flaring portion of said chamber and diminishing toward the bottom thereof.

In testimony whereof I have hereunto signed my name to this specification.

VALENTINE ARNOLD. 

